Gather flour, cocoa powder, sugar, butter, eggs, chocolate chips, and mini marshmallows.
Cream together butter and sugar. Add eggs and vanilla extract.
Incorporate cocoa powder for rich chocolatey taste.
Fold in chocolate chips for extra indulgence.
Roll dough into balls and place on a baking sheet.
Press mini marshmallows onto the dough balls.
Bake until cookies are set and marshmallows are toasted.